D. convergence... pictorial depth cues
<u>Answer:</u>
For a. Neutrons and electrons also form an atom.
For b. The element is oxygen which is a non-metal and will form a negative ion while forming ionic bond.
<u>Explanation:</u>
There are 3 subatomic particles which form an atom. These are neutrons, protons and electrons.
Neutrons carry no charge, protons carry positive charge and electrons carry negative charge. Neutrons and protons are present in nucleus and electrons revolve around the nucleus.
The energy which is present between neutrons and protons are nuclear energy and the energy which is present between electrons and protons are electrostatic energy.
In an element, number of protons is always equal to the number of electrons. The atomic number is equal to the number of protons or electrons. The element which has atomic number 8 is Oxygen.
The electronic configuration of this element is
This element requires only 2 electrons to form a stable electronic configuration. An element which gains electron is considered as a non-metal and forms a negative ion because number of electrons increases.
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<u>Answer:</u>
W is the correct answer.
<u>Explanation:</u>
Since the charges are negative the forces acting is repulsive.
The left -4C charge repulse -3C, the force is shown in figure given as F2
The right -4C charge repulse -3C, the force is shown in figure given as F1
Since the charge magnitudes are same the magnitude of F1 and F2 are same, but their direction is different. From second figure we can see the angle between forces and W is 30⁰.
On resolving vectors the force along Z = F1 sin 30 and force along X = F2 sin 30
Since magnitudes are same they cancel each other.
Force along W = F1 cos 30 + F2 cos30 = 2Fcos 30 (Say F1 = F2 = F)
So net force is directed towards Z.